Vacuum cleaner



FIG. 1 is a top plan view of a vacuum cleaner showing our new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is an opposite side elevational view thereof;

FIG. 5 is a rear elevational view thereof; and

FIG. 6 is a front elevational view thereof. 

The ornamental design for a vacuum cleaner, as shown and described. 